CN110542877A - current analysis and diagnosis device for CVT secondary voltage testing device - Google Patents
current analysis and diagnosis device for CVT secondary voltage testing device Download PDFInfo
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- CN110542877A CN110542877A CN201810523758.1A CN201810523758A CN110542877A CN 110542877 A CN110542877 A CN 110542877A CN 201810523758 A CN201810523758 A CN 201810523758A CN 110542877 A CN110542877 A CN 110542877A
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- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000004458 analytical method Methods 0.000 title claims abstract description 13
- 238000003745 diagnosis Methods 0.000 title claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 9
- 230000005693 optoelectronics Effects 0.000 claims description 5
- 238000012806 monitoring device Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000013307 optical fiber Substances 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
the invention discloses a current analysis and diagnosis device for a CVT secondary voltage testing device, which comprises a relay, a current-voltage converter, a proportional operation circuit, a low-pass filter circuit, a voltage amplification circuit and a microprocessor chip, wherein the switch side of the relay is arranged between the CVT secondary side and the voltage testing device; the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit; the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit; the output end of the low-pass filter circuit is electrically connected with the input end of the micro-processing chip; the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit; the output end of the voltage amplifying circuit is electrically connected with the control end of the relay. The invention can monitor the current of the CVT collecting end, and when the current exceeds the set threshold, the test loop is disconnected, thereby effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
Description
Technical Field
the invention relates to the field of current testing, in particular to a current analysis and diagnosis device for a CVT secondary voltage testing device.
Background
a Capacitor Voltage Transformer (CVT) is widely used in an electric power system, mainly used for monitoring the Voltage conditions of a power bus and a line, and is an electric power device for Voltage measurement, power measurement and control, automatic control and relay protection and also used as a power line carrier Capacitor.
The CVT mainly obtains the voltage of a bus or a line in a capacitance voltage division mode, and then the actual voltage of the bus or the line is reduced to the secondary side of 100V/57.7V at the maximum through an electromagnetic transformer. Then the system such as dispatching and relay protection is used for obtaining the voltage, and the actual voltage of the bus or the line is reversely deduced. During actual operation, the voltage acquired by the dispatching and relay protection system from the CVT can only be used for monitoring the operation condition of the bus or the line, the condition of the CVT equipment is not concerned, and if the CVT fails, the voltage monitoring is abnormal, which may cause misjudgment on the dispatching and relay protection system. Therefore, ensuring the CVT healthy operation is very important for the stable operation of the power system.
Therefore, the existing electric power enterprises use the CVT voltage online monitoring device to judge the health status of the CVT by acquiring CVT voltage data from the scheduling system. But the CVT voltage goes through a long physical and communication link to the scheduling system. And the voltage of the dispatching system can be caused to be in a problem if the information is transmitted by mistake or the contact is poor. Therefore, whether the CVT is defective or not cannot be accurately judged even if the voltage is wrong. However, if a short circuit or other fault occurs on the secondary side of the CVT or on the collection port of the device, the device may be damaged, and the CVT device may even be damaged, which may cause serious problems.
disclosure of Invention
The invention overcomes the defects of the existing CVT detection and provides a novel current analysis and diagnosis device for a CVT secondary voltage testing device. The invention realizes that the current of the CVT acquisition end can be monitored when the CVT on-line monitoring device works, and the test loop is disconnected when the current exceeds the set threshold value, thereby preventing the short circuit phenomenon on the secondary side of the CVT and effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a current analysis and diagnosis device for CVT secondary voltage test device comprises a relay, a current-voltage converter, a proportional operation circuit, a low-pass filter circuit, a voltage amplification circuit and a microprocessor chip,
the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
The current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the micro-processing chip;
the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay;
wherein, the low-pass filter circuit comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein,
one end of the first resistor is used as the input end of the low-pass filter, and the other end of the first resistor is electrically connected with one end of the first inductor;
The other end of the first inductor is electrically connected with one end of the first capacitor;
The other end of the first inductor is electrically connected with one end of the second inductor;
The other end of the first capacitor is grounded;
the other end of the second inductor is electrically connected with one end of the second capacitor;
the other end of the first capacitor is electrically connected with the other end of the second capacitor;
The other end of the second inductor is electrically connected with one end of a third inductor;
The other end of the second resistor is electrically connected with the other end of the second capacitor;
the other end of the third inductor is electrically connected with one end of the second resistor, and the other end of the third inductor is used as the output end of the low-pass filter circuit.
the working process of the invention is as follows:
the current-voltage converter converts a current signal (0-1A) on the secondary side of the CVT into a voltage signal (0-24V)
) And voltage signals are subjected to voltage division through a proportional operation circuit, and then analog-to-digital conversion is performed through an AD conversion module to obtain digital voltage division signals. And the micro-processing chip judges whether the secondary side of the CVT has a short circuit phenomenon or not according to the digital voltage division signal. If the short circuit phenomenon occurs, the micro-processing chip sends out a high-voltage signal, the voltage is boosted through the voltage amplifying circuit, and therefore the relay is triggered to disconnect a test circuit on the secondary side of the CVT, and relevant equipment is protected.
In a preferred embodiment, the proportional operation circuit includes a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and an operational amplifier,
one end of the third resistor is used as the input end of the proportional operation circuit, and one end of the third resistor is electrically connected with one end of the fifth resistor;
The other end of the fifth resistor is electrically connected with the non-inverting input end of the operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is grounded;
The other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
The other end of the third resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the inverting input end of the operational amplifier;
the other end of the sixth resistor is electrically connected with one end of the eighth resistor;
The other end of the eighth resistor is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is used as the output end of the proportional operational circuit.
in a preferred embodiment, the operational amplifier is a rail-to-rail operational amplifier.
in the preferred embodiment, the rail-to-rail operational amplifier has an input overvoltage protection function, and no inversion or latch occurs in a range higher or lower than the voltage of the power supply rail within 32V. When the acquisition end is suddenly disconnected or other problems cause overlarge acquisition voltage, overvoltage protection can be carried out on the testing device.
In a preferred embodiment, the resistance value of the fifth resistor in the proportional operation circuit is equal to the resistance value of the sixth resistor; the resistance value of the seventh resistor is equal to the resistance value of the eighth resistor.
The preferred solution consists in simplifying the circuit design.
in a preferred embodiment, the resistance value of the fifth resistor in the proportional operation circuit is equal to the resistance value of the seventh resistor.
the preferred solution consists in simplifying the circuit design.
In a preferred embodiment, the voltage amplifying circuit includes a ninth resistor, a tenth resistor, a first NPN transistor, and a second NPN transistor, wherein,
One end of the ninth resistor is used as the input end of the voltage amplifying circuit, and the other end of the ninth resistor is electrically connected with the base level of the first NPN triode;
the collector of the first NPN triode is grounded;
The emitter of the first NPN triode is electrically connected with the emitter of the second NPN triode;
the base level of the second NPN triode is grounded;
the collector of the second NPN triode is electrically connected with one end of a tenth resistor;
one end of the tenth resistor is used as the output end of the voltage amplifying circuit, and the other end of the tenth resistor is grounded.
in a preferred embodiment, the amperometric diagnostic device further comprises a data memory, and an input end of the data memory is electrically connected with the second output end of the microprocessor chip.
in the preferred embodiment, the data storage is used to store relevant short circuit information on the secondary side of the CVT.
in a preferred embodiment, the amperometric diagnostic device further comprises an optoelectronic interface, and an input end of the optoelectronic interface is electrically connected with the third output end of the microprocessor chip.
In the preferred embodiment, the photoelectric interface is used for transmitting the short circuit information of the secondary side of the CVT to a remote system through an optical fiber.
In a preferred embodiment, the current analysis and diagnosis device further includes a wireless communication module, and an input end of the wireless communication module is electrically connected to a fifth output end of the microprocessor chip.
In the preferred scheme, the wireless communication module is used for sending the short-circuit information of the secondary side of the CVT to the hands of workers.
in a preferred embodiment, the current analysis and diagnosis device further comprises an LCD screen, and an input end of the LCD screen is electrically connected to the fourth output end of the microprocessor chip.
in the preferred scheme, the LCD display screen is used for displaying the collected information of the secondary side of the CVT.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
The invention realizes that the current of the CVT acquisition end can be monitored when the CVT on-line monitoring device works, and the test loop is disconnected when the current exceeds the set threshold value, thereby preventing the short circuit phenomenon on the secondary side of the CVT and effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
drawings
fig. 1 is a module installation diagram of the embodiment.
fig. 2 is a circuit diagram of a low-pass filter in an embodiment.
Detailed Description
the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
as shown in fig. 1, a current analysis and diagnosis device for a CVT secondary voltage test device comprises a relay, a current-voltage converter, a proportional operation circuit, a low pass filter circuit, a TF card, a 4G communication module, an LCD display screen, an electro-optical interface, a voltage amplification circuit, and an MSP430F5, wherein,
the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
the current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
The output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
The output end of the low-pass filter circuit is electrically connected with the input end of the MSP430F 5;
a first output end of the MSP430F5 is electrically connected with an input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay;
the input end of the TF card is electrically connected with a second output end of the MSP430F 5;
the input end of the 4G communication module is electrically connected with the third output end of the MSP430F 5;
the input end of the LCD screen is electrically connected with the fourth output end of the MSP430F 5;
an input terminal of the optoelectronic interface is electrically connected to a fifth output terminal of the MSP430F 5.
as shown in fig. 2, the low-pass filter circuit includes a first resistor, a second resistor, a first capacitor, a second capacitor, a first inductor, a second inductor, and a third inductor, wherein,
One end of the first resistor is used as the input end of the low-pass filter, and the other end of the first resistor is electrically connected with one end of the first inductor;
the other end of the first inductor is electrically connected with one end of the first capacitor;
the other end of the first inductor is electrically connected with one end of the second inductor;
the other end of the first capacitor is grounded;
the other end of the second inductor is electrically connected with one end of the second capacitor;
The other end of the first capacitor is electrically connected with the other end of the second capacitor;
The other end of the second inductor is electrically connected with one end of the third inductor;
the other end of the second resistor is electrically connected with the other end of the second capacitor;
the other end of the third inductor is electrically connected with one end of the second resistor, and the other end of the third inductor is used as the output end of the low-pass filter circuit.
Wherein the proportional operational circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a rail-to-rail operational amplifier,
One end of the third resistor is used as the input end of the proportional operation circuit, and one end of the third resistor is electrically connected with one end of the fifth resistor;
the other end of the fifth resistor is electrically connected with the non-inverting input end of the rail-to-rail operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
The other end of the seventh resistor is grounded;
the other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
The other end of the third resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the inverting input end of the rail-to-rail operational amplifier;
the other end of the sixth resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with the output end of the rail-to-rail operational amplifier, and the output end of the rail-to-rail operational amplifier is used as the output end of the proportional operational circuit;
The resistance value of the fifth resistor is equal to that of the sixth resistor;
the resistance value of the seventh resistor is equal to that of the eighth resistor;
The resistance value of the fifth resistor is equal to the resistance value of the seventh resistor.
Wherein, the voltage amplifying circuit comprises a ninth resistor, a tenth resistor, a first NPN triode and a second NPN triode,
one end of the ninth resistor is used as the input end of the voltage amplifying circuit, and the other end of the ninth resistor is electrically connected with the base level of the first NPN triode;
the collector of the first NPN triode is grounded;
the emitter of the first NPN triode is electrically connected with the emitter of the second NPN triode;
the base level of the second NPN triode is grounded;
a collector of the second NPN triode is electrically connected with one end of the tenth resistor;
One end of the tenth resistor is used as the output end of the voltage amplifying circuit, and the other end of the tenth resistor is grounded.
the working process of the embodiment is as follows:
the MSP430F5 receives the data, when the voltage output by the proportional operation circuit is larger than 1.2V, the secondary side of the CVT can be judged to have a fault, and the single chip microcomputer generates a high level on the P1. And then the voltage amplifying circuit is connected to a coil of the relay, so that the normally closed contact is controlled to be disconnected, and the whole test circuit is disconnected for protecting the secondary side. Meanwhile, an LCD display screen displays the secondary side acquisition information of the CVT, a TF card is used for storing the acquisition information, and a photoelectric interface is used for transmitting the acquisition information of the secondary side of the CVT to a remote system through an optical fiber; the 4G communication module is used for sending the information of the occurrence of the secondary side short circuit of the CVT to the hands of the workers.
the same or similar reference numerals correspond to the same or similar parts;
The terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A current analysis and diagnosis device for a CVT secondary voltage test device is characterized by comprising a relay, a current-voltage converter, a proportional operation circuit, a low-pass filter circuit, a voltage amplification circuit and a micro-processing chip, wherein,
the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
The current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the micro-processing chip;
the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay;
wherein, the low-pass filter circuit comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a first inductor, a second inductor and a third inductor, wherein,
one end of the first resistor is used as the input end of the low-pass filter, and the other end of the first resistor is electrically connected with one end of the first inductor;
the other end of the first inductor is electrically connected with one end of the first capacitor;
the other end of the first inductor is electrically connected with one end of the second inductor;
The other end of the first capacitor is grounded;
the other end of the second inductor is electrically connected with one end of the second capacitor;
the other end of the first capacitor is electrically connected with the other end of the second capacitor;
the other end of the second inductor is electrically connected with one end of a third inductor;
The other end of the second resistor is electrically connected with the other end of the second capacitor;
the other end of the third inductor is electrically connected with one end of the second resistor, and the other end of the third inductor is used as the output end of the low-pass filter circuit.
2. the current analysis diagnostic apparatus of claim 1, wherein the proportional operational circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and an operational amplifier,
One end of the third resistor is used as the input end of the proportional operation circuit, and one end of the third resistor is electrically connected with one end of the fifth resistor;
the other end of the fifth resistor is electrically connected with the non-inverting input end of the operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the seventh resistor is grounded;
the other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
the other end of the third resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the inverting input end of the operational amplifier;
The other end of the sixth resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is used as the output end of the proportional operational circuit.
3. the amperometric diagnostic device of claim 2, wherein said operational amplifier is a rail-to-rail operational amplifier.
4. The current analysis and diagnosis device according to claim 3, wherein the resistance value of the fifth resistor in the proportional operation circuit is equal to the resistance value of the sixth resistor; the resistance value of the seventh resistor is equal to the resistance value of the eighth resistor.
5. The current analysis and diagnosis device according to claim 4, wherein the resistance value of the fifth resistor and the resistance value of the seventh resistor in the proportional operation circuit are equal.
6. the apparatus according to any one of claims 1 to 5, wherein the voltage amplifying circuit comprises a ninth resistor, a tenth resistor, a first NPN transistor and a second NPN transistor, wherein,
one end of the ninth resistor is used as the input end of the voltage amplifying circuit, and the other end of the ninth resistor is electrically connected with the base level of the first NPN triode;
The collector of the first NPN triode is grounded;
The emitter of the first NPN triode is electrically connected with the emitter of the second NPN triode;
the base level of the second NPN triode is grounded;
the collector of the second NPN triode is electrically connected with one end of a tenth resistor;
One end of the tenth resistor is used as the output end of the voltage amplifying circuit, and the other end of the tenth resistor is grounded.
7. the amperometric diagnostic device of claim 6, further comprising a data memory, wherein an input of the data memory is electrically connected to the second output of the microprocessor chip.
8. The amperometric diagnostic device of claim 1, 2, 3, 4, 5 or 7, further comprising an optoelectronic interface, wherein an input of the optoelectronic interface is electrically connected to the third output of the microprocessor chip.
9. the amperometric diagnostic device of claim 8, further comprising an LCD screen, wherein an input terminal of the LCD screen is electrically connected to the fourth output terminal of the microprocessor chip.
10. The amperometric diagnostic device of claim 1, 2, 3, 4, 5, 7 or 9, further comprising a wireless communication module, wherein an input terminal of the wireless communication module is electrically connected to the fifth output terminal of the microprocessor chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810523758.1A CN110542877A (en) | 2018-05-28 | 2018-05-28 | current analysis and diagnosis device for CVT secondary voltage testing device |
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| CN201810523758.1A CN110542877A (en) | 2018-05-28 | 2018-05-28 | current analysis and diagnosis device for CVT secondary voltage testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111551886A (en) * | 2020-04-16 | 2020-08-18 | 国网河南省电力公司电力科学研究院 | Harmonic voltage measurement error calculation method and device based on CVT capacitance current |
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| CN208607349U (en) * | 2018-05-28 | 2019-03-15 | 广东电网有限责任公司 | A kind of amperometry diagnostic device for CVT secondary voltage test device |
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| CN111551886A (en) * | 2020-04-16 | 2020-08-18 | 国网河南省电力公司电力科学研究院 | Harmonic voltage measurement error calculation method and device based on CVT capacitance current |
| CN111551886B (en) * | 2020-04-16 | 2022-04-22 | 国网河南省电力公司电力科学研究院 | Harmonic voltage measurement error calculation method and device based on CVT capacitance current |
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